Whose hand is this?
It's SpongeBob's hand.
Whose hammer is this?
It's Thor's hammer.
Whose shield is this?
It's Captain America's shield.
Whose hand is this?
It's Mickey's hand.
Whose building is this?
It's Tony Stark's building. / It's The Avenger's building.
Whose eyes are these?
They're Spider-Man's eyes.
Whose sister is she?
She's Elsa's sister.
Whose house is this?
It's Minnie's house.